The former fiance of Gov. Sarah Palin’s 18-year-old daughter says he believes he knows why the Alaska governor is resigning – concerns over money.

Nineteen-year-old Levi Johnston, whose wedding to Bristol Palin was called off earlier this year, says he thinks the governor is resigning over personal finances.

Johnston says he lived with the Palin family from early December to the second week in January. He claims he heard the governor several times say how nice it would be to take advantage of the lucrative deals that were being offered, deals that included a reality show and a book.

Johnston made his comments at a news conference Thursday at his lawyer’s office.

He and Bristol have a son, Tripp, born in December.

Johnston has had a strained relationship with the Palin family and has gone to the national media before.